GB2035453A - I.c. engine gas recirculation and idling air control system - Google Patents
I.c. engine gas recirculation and idling air control system Download PDFInfo
- Publication number
- GB2035453A GB2035453A GB7941969A GB7941969A GB2035453A GB 2035453 A GB2035453 A GB 2035453A GB 7941969 A GB7941969 A GB 7941969A GB 7941969 A GB7941969 A GB 7941969A GB 2035453 A GB2035453 A GB 2035453A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- gas recirculation
- exhaust gas
- speed control
- idle speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
- F02D31/002—Electric control of rotation speed controlling air supply
- F02D31/003—Electric control of rotation speed controlling air supply for idle speed control
- F02D31/005—Electric control of rotation speed controlling air supply for idle speed control by controlling a throttle by-pass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/08—Introducing corrections for particular operating conditions for idling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/55—Systems for actuating EGR valves using vacuum actuators
- F02M26/56—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves
- F02M26/57—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves using electronic means, e.g. electromagnetic valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M3/00—Idling devices for carburettors
- F02M3/06—Increasing idling speed
- F02M3/07—Increasing idling speed by positioning the throttle flap stop, or by changing the fuel flow cross-sectional area, by electrical, electromechanical or electropneumatic means, according to engine speed
- F02M3/075—Increasing idling speed by positioning the throttle flap stop, or by changing the fuel flow cross-sectional area, by electrical, electromechanical or electropneumatic means, according to engine speed the valve altering the fuel conduit cross-section being a slidable valve
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Description
1
GB2035453A
1
SPECIFICATION
An exhaust gas recirculation and idle speed control device.
5
The present invention relates to a device for controlling amounts of exhaust gas recirculation and idle speeds of an internal combustion engine.
10 The exhaust gas recirculation system (which is referred to as "EGR" hereinafter) is a method of purifying exhaust gases of internal combustion engines, which intends to reintroduce a part of the exhaust gas into an intake 15 air flow to restrain temperature rise in a combustion chamber, thereby reducing the generation of nitrous oxides (NOx).
Recently, moreover, it has been required to control idling (no-load) revolutions precisely in 20 order to improve the purification of the exhaust gases and to decrease the fuel consumption. (The idle speed control is referred to as "ISC" hereinafter.)
In carrying out the above EGR and ISC, the 25 recirculation and idle speed have been separately controlled. Referring to Fig. 1, intake air is supplied through an intake air tube 1 to an engine 2 as shown in broken line arrows. A part of the exhaust gas is re-introduced into 30 the intake air tube 1 through an EGR tube 4 branched off an exhaust tube 3 and an EGR control valve 5 provided in the EGR tube 4 as shown in solid line arrows.
On the other hand, upstream and down-35 stream sides of a throttle valve 6 provided in the intake air tube 1 are connected by a bypass 7 including an ISC control valve 8.
Intake negative pressure downstream of the throttle valve 6 is withdrawn through a nega-40 tive pressure tube 9 and fed through constant pressure valves 10 and 11 to the EGR control valve 5, solenoid valve 12, ISC control valve 8 and solenoid valve 13.
The solenoid valves 1 2 and 1 3 close and 45 open in response to control signals S5 and S6 from a control circuit 14 to shut off the negative and atmospheric pressures alternately. Accordingly, the negative pressures supplied to the EGR control valve 5 and ISC 50 control valve 8 vary to change open areas of these control valves, thereby enabling the amounts of EGR and intake air flow rate when idling to be controlled.
The control circuit 14 consists of, for exam-55 pie, a micro computer, to which various signals corresponding to the operating parameters of the engine are supplied, such as intake air flow signals S1( engine revolution signals S2, engine temperature signals S3, throttle 60 valve open area signals S4 and the like. Then the control circuit effects required arithmetic processes for these signals to generate control signals S5 or S6 for optimum amounts of EGR or intake air flow rate.
65 With the hitherto used devices, as above described the EGR and ISC are controlled in completely separate systems each having one solenoid valve. As these solenoid valves are required to close and open exactly in high 70 responsibility according to given control signals, they become inevitably precise and expensive to increase the cost of the entire device.
In order to solve this problem, a system has 75 been proposed wherein the EGR and ISC are changed to be controlled by one solenoid. In this case, the ISC is effected only when a throttle valve is closed (when idling) and the EGR is effected only at the time other than 80 the above time because the amount of NOx is little to an extent not requiring the EGR when idling. Therefore, there is provided with one solenoid valve and a change-over valve for supplying the negative pressure regulated by 85 the solenoid valve to any one of the ISC and EGR control valves at the time when the throttle valve is completely closed or other than the time, thereby enabling only one solenoid valve to control the EGR and ISC. 90 When a throttle valve is closed to the most possible extent, there is generally a clearance between a periphery of the valve body and a wall of an intake air passage. It will be therefore understood that the expression 95 "throttle valve is closed" used herein means the closed position of a throttle valve when idling.
With the above system, while the EGR control valve is opened when the change-over 100 valve is changed from the EGR to ISC, the EGR control valve is kept opened, so that the EGR is effected during idling of the engine and therefore the revolutions of the engine tends to be unstable.
105 It is an object of the invention to provide an improved exhaust gas recirculation and idle speed control device for an internal combustion engine, which eliminates all the disadvantages of the prior art.
110 It is another object of the invention to provide an exhaust gas recirculation and idle speed control device, which is capable of controlling both the exhaust gas recirculation and the idle revolutions of the engine by 11 5 means of only one solenoid valve.
In order to achieve the above objects, the device according to the invention comprises a timer circuit in the control circuit to provide a constant delay time determined by the timer 120 circuit in changing from the EGR to ISC, during which an EGR control valve is completely closed and thereafter a change-over valve is changed to the position for ISC.
In a preferred embodiment of the invention, 125 a negative pressure chamber of an EGR control valve is provided with an atmosphere relief valve to open the negative pressure chamber of the EGR control valve to the atmosphere, thereby completely closing the 1 30 EGR control valve when a throttle valve is
2
GB2035 453A 2
closed or when idling.
The invention will be more fully understood by referring to the following detailed specification and claims taken in connection with the 5 appended drawings.
Figure 1 illustrates an arrangement of an exhaust gas recirculation control device and an idle speed control device of the prior art as mentioned above;
10 Figure 2 shows an arrangement of one embodiment of an exhaust gas recirculation and idle speed control device according to the invention;
Figures 3a and 3b illustrate wave forms of 15 signals used in the embodiment shown in Fig.
2;
Figures 4a and 4b illustrate control flow charts of a control circuit used in the embodiment shown in Fig. 2; and 20 Figure 5 shows an arrangement of another embodiment of the device according to the invention.
Fig. 2 illustrates one embodiment of the device according to the invention, wherein 25 like components have been designated by the same reference numerals as in Fig. 1. Figs. 3a and 3b show wave forms of signals shown in Fig. 2. for changing from EGR to ISC and from ISC to EGR, respectively. S4 and S7-S9 30 in Fig. 3 correspond of course the same references in Fig. 2.
Referring to Fig. 2, a timer circuit 15 produces the continuous signals S7 during a determined delay time r, starting from a time 35 T, when the throttle open signal S4 indicates 1 the close of the throttle valve. For example, a signal "1" of the throttle open signal S4 indicates the close of the throttle valve, while a signal "0" indicates the other throttle valve 40 condition. 1
The device further comprises a constant pressure valve 16, a solenoid valve 17 and a change-over valve 18. The negative pressure regulated by the solenoid valve 17 is supplied 45 through the change-over valve 18 to any one 1 of the EGR control valve 5 and ISC control valve 8. The changeover valve 18 is changed to provide the negative pressure to the EGR control valve 5 when the change-over signal 50 S8 from the control circuit 14 is "1" or to 1
provide the negative pressure to the ISC control valve 8 when the change-over signal S8 is "0". The change-over signal S8 continues to be "1" during the delay time r, even if the 55 signal S4 has changed from "0" to "1" but 1 the change-over signal S8 changes from "1" to "0" at a moment T2 when the signal S7 changed from "1" to "0".
The control signal Sg in a pulse signal of 60 repetition type produced in the control circuit 1 14 corresponding to various operating parameters of the engine and continues to be "1" during the dealy time t-, during which its duty factor is 100%.
65 Accordingly, as the solenoid valve 17 is 1
fully opened during the delay time r, when changing from the EGR to ISC, the negative pressure supplied to the EGR control valve 5 becomes zero or the atmospheric pressure, so that the EGR control valve 5 is completely closed and thereafter the change-over valve 18 is changed to the ISC, with the result that the EGR is completely prevented during the idling of the engine.
The delay time t, is sufficient to be, for example, in the order of 0.1-1 second, and therefore the delay or lost time during the changing does not adversely affect the control of the device.
In case of changing from the ISC to EGR, on the other hand, as shown in Fig. 3b, when the signal S4 changes from "1" to "0" at the moment T3 (the throttle valve changes from closed to opened), the signal S8 changes immediately from "0" to "1" to change the change-over valve 18 so as to supply the negative pressure to the EGR control valve 5.
The timer circuit 1 5 may be a circuit which produces signals S7 while clock pulses of a determined number are counted (t, is constant). As an alternative, the timer circuit 1 5 may be a circuit which produces signals S7 while revolution signals of a determined number in synchronism with revolutions of the engine are counted (t, varies with the revolution per minute of the engine). In case of that the control circuit 14 comprises a micro computer, the timer circuit 15 may be included in the micro computer, although it is separately illustrated in Fig. 2.
Figs. 4a and 4b illustrate control flow charts when a micro computer is used as the control circuit 14. The flow chart shown in Fig. 4a is for generating the change-over signal S8 and control signal Sg and the flow chart in Fig. 4b is for the timer signal S7. In Fig. 4b, for example, frequencies of clock pulses are divided to generate a pulse per 0.1 second and an interruption is effected.
Fig. 5 illustrates other embodiment of the invention, wherein like components have been designated by the same reference numerals as in Fig. 2. The device comprises an atmosphere relief valve 19 in addition to the constant pressure valve 1 6, solenoid valve 17 and change-over valve 18. The negative pressure regulated by the solenoid valve 17 is supplied through the change-over valve 18 to any one of the EGR and ISC control valves 5 and 8. The change-over valve 18 is controlled by change-over signals S8 to be changed so as to provide the negative pressure to the ISC control valve 8 when the throttle valve 6 is closed and to provide the negative pressure to the EGR control valve 5 at the time other than the throttle valve being closed.
The atmosphere relief valve 19 is controlled by control signals S10 and kept closed during the time other than the throttle valve being closed but is fully opened when the throttle
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3
GB2 035 453A
3
valve is completely closed. When the atmosphere relief valve 19 is fully opened, a negative pressure chamber 5' of the EGR control valve 5 opens into the atmosphere and 5 therefore the EGR control valve 5 is completely closed.
Accordingly, when the change-over valve 18 is changed from the EGR to ISC, the EGR control valve 5 is completely closed without 10 fail, so that the EGR is completely prevented during the idling of the engine.
Although the atmosphere relief valve 1 9 is exemplarily provided in a tube connecting the EGR control valve 5 and change-over valve 15 18 in Fig. 5, the atmoshere relief valve 1 9 may be directly connected to the negative pressure chamber 5' of the EGR control valve 5.
All that is required of the atmosphere relief 20 valve 1 9 is to have the closing and opening functions without requiring any high responsibility and accuracy, so that the atmosphere relief valve 19 is very inexpensive in comparison with the solenoid valve.
25 As can be seen from the above description, the device according to the invention can control both the EGR and ISC by means of only one expensive solenoid valve and prevents malfunctions in changing the EGR and 30 ISC to provide an inexpensive and high performance EGR and ISC control device.
It is further understood by those skilled in the art that the foregoing description is preferred embodiments of the disclosed device 35 and that various changes and modifications may be made in the invention without departing from the spirit and scope thereof.
Claims (8)
- 40 1. An exhaust gas recirculation and idle speed control device for an internal combustion engine including an exhaust gas recirculation control valve responsive to negative pressure for controlling amounts of exhaust gas 45 recirculation, an idle speed control valve responsive to negative pressure for controlling intake air flow rate when idling, a solenoid valve for regulating intake negative pressure, a change-over valve being changed to supply 50 the negative pressure regulated by the solenoid valve to any one of said exhaust gas recirculation and idle speed control valves and a control circuit for generating signals depending upon engine operating parameters for 55 controlling said solenoid valve and for changing said change-over valve to the idle speed control valve side when a throttle valve is closed and changing said change-over valve to the exhaust gas recirculation control valve 60 side at the time other than when the throttle valve is closed, comprising signal generating means for generating signals for changing said change-over valve from the exhaust gas recirculation control valve side to the idle 65 speed control valve side after a determined delay time has lapsed from a moment when the throttle valve was closed and signals for controlling said solenoid valve to fully open said exhaust gas recirculation control valve 70 during said delay time.
- 2. An exhaust gas recirculation and idle speed control device as set forth in claim 1, wherein said signal generating means comprises a timer circuit for generating a continu-75 ous delay signal during said determined delay time and generates said signal for changing said change-over valve from the exhaust gas recirculation control valve side to the idle speed control valve side when said delay 80 signal is changed.
- 3. An exhaust gas recirculation and idle speed control device as set forth in claim 1, wherein during said determined delay time said solenoid valve is fully opened to provide85 atmospheric pressure to said exhaust gas recirculation control valve which is thus completely closed and thereafter said change-over valve is changed.
- 4. An exhaust gas recirculation and idle 90 speed control device as set forth in claim 1,wherein when said throttle valve is changed from the closed to opened position, said change-over valve is immediately changed from the idle speed control side to the exhaust 95 gas recirculation side.
- 5. An exhaust gas recirculation and idle speed control device as set forth in claim 2, wherein said timer circuit produces said signal while clock pulses of a determined number100 are counted.
- 6. An exhaust gas recirculation and idle speed control device as set forth in claim 2, wherein said timer circuit produces said signal while revolution signals of a determined num-105 ber in synchronism with revolutions of the engine are counted.
- 7. An exhaust gas recirculation and idle speed control device as set forth in claim 1, wherein said device comprises an atmoshpere110 relief valve connected to a negative pressure chamber of said exhaust gas recirculation control valve and means for generating a signal for fully opening said atmosphere relief valve when said throttle valve is closed thereby1 1 5 providing atmospheric pressure to said negative pressure chamber when said throttle valve is closed to completely close said exhaust gas recirculation control valve.
- 8. An exhaust gas recirculation and idle1 20 speed control device for an internal combustion engine substantially as hereinbefore described with reference to Figs. 2 to 5 of the accompanying drawings.Printed for Her Majesty's Stationery Office by Burgess & Son (Abingdon) Ltd.—1980.Published at The Patent Office, 25 Southampton Buildings,London, WC2A 1AV, from which copies may be obtained.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14993078A JPS5578149A (en) | 1978-12-06 | 1978-12-06 | Exhaust gas return and idling speed control device for internal combustion engine |
| JP15101078A JPS5578151A (en) | 1978-12-08 | 1978-12-08 | Exhaust gas return and idling speed control for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2035453A true GB2035453A (en) | 1980-06-18 |
| GB2035453B GB2035453B (en) | 1983-03-23 |
Family
ID=26479674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7941969A Expired GB2035453B (en) | 1978-12-06 | 1979-12-05 | I.c. engine gas recirculation and idling air control system |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4281631A (en) |
| DE (1) | DE2948963C2 (en) |
| FR (1) | FR2443583A1 (en) |
| GB (1) | GB2035453B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4281631A (en) * | 1978-12-06 | 1981-08-04 | Nissan Motor Company, Limited | Exhaust gas recirculation and idle speed control device |
| US4289107A (en) * | 1979-12-28 | 1981-09-15 | Ford Motor Company | Engine carburetor throttle blade positioning control |
| US4300516A (en) * | 1979-05-15 | 1981-11-17 | Nissan Motor Company, Ltd. | System and method for controlling exhaust gas recirculation |
| FR2497283A1 (en) * | 1980-12-26 | 1982-07-02 | Fuji Heavy Ind Ltd | AIR / FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE WITH DOUBLE BODY CARBURETOR |
| EP0229315A2 (en) * | 1985-12-10 | 1987-07-22 | Hitachi, Ltd. | Automotive engine idle speed control device |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5724433A (en) * | 1980-07-16 | 1982-02-09 | Toyota Motor Corp | Control method of idle speed |
| JPS57124064A (en) * | 1981-01-27 | 1982-08-02 | Mazda Motor Corp | Exhaust gas returning device for engine |
| JPS5832958A (en) * | 1981-08-19 | 1983-02-26 | Mitsubishi Electric Corp | Electric air-fuel control device for internal-combustion engine |
| JPS5835255A (en) * | 1981-08-27 | 1983-03-01 | Toyota Motor Corp | Exhaust gas recycling device for diesel engine |
| JPS5886448U (en) * | 1981-12-07 | 1983-06-11 | 日産自動車株式会社 | Internal combustion engine idle air amount adjustment device |
| US4614184A (en) * | 1984-06-22 | 1986-09-30 | Canadian Fram Limited | Single solenoid control of sequential multiple actuators |
| US4597047A (en) * | 1984-07-13 | 1986-06-24 | Motorola, Inc. | Engine control system including engine idle speed control |
| US4660519A (en) * | 1984-07-13 | 1987-04-28 | Motorola, Inc. | Engine control system |
| DE4130853C2 (en) * | 1990-09-29 | 1998-09-10 | Volkswagen Ag | Method for controlling the amount of exhaust gas recirculated in an internal combustion engine |
| JPH05288123A (en) * | 1992-04-10 | 1993-11-02 | Toyota Motor Corp | Exhaust gas circulation apparatus for internal combustion engine |
| JP2922099B2 (en) * | 1993-09-29 | 1999-07-19 | 三菱電機株式会社 | Self-diagnosis device of exhaust gas recirculation device |
| JPH0814110A (en) * | 1994-06-29 | 1996-01-16 | Nippondenso Co Ltd | Controller for interna combustion engine |
| US6158415A (en) * | 1997-06-02 | 2000-12-12 | Toyota Jidosha Kabushiki Kaisha | Idling speed control device of internal combustion engine and variable vibration isolating support device |
| JP4333725B2 (en) * | 2006-10-25 | 2009-09-16 | トヨタ自動車株式会社 | Exhaust gas recirculation device for internal combustion engine |
| US8851066B1 (en) * | 2009-04-01 | 2014-10-07 | Kelvin L. Kapteyn | Thermal energy storage system |
| DE102013018978A1 (en) * | 2013-11-14 | 2015-05-21 | Man Truck & Bus Ag | Method for simulating the operation of an internal combustion engine and apparatus for carrying out the method |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7317531U (en) * | 1975-05-07 | Pierburg A Autogeraetebau Kg | Control device for the recirculation of exhaust gas | |
| DE2137694A1 (en) * | 1971-07-28 | 1973-02-08 | Bosch Gmbh Robert | SOLENOID VALVE FOR EXHAUST GAS RECIRCULATION IN COMBUSTION MACHINES |
| US3915136A (en) * | 1974-02-25 | 1975-10-28 | Ranco Inc | Control system for exhaust gas recirculating valve |
| JPS5244732Y2 (en) * | 1974-09-17 | 1977-10-12 | ||
| JPS51144828A (en) * | 1975-06-09 | 1976-12-13 | Nissan Motor Co Ltd | Synthetic exhaust countermeasure system for internal combustion engine |
| JPS5247139A (en) * | 1975-10-14 | 1977-04-14 | Toyota Motor Corp | Effective compensator in an engine of electronic controlled fuel injec tion system |
| JPS5340105A (en) * | 1976-09-24 | 1978-04-12 | Nippon Denso Co Ltd | Automobile control unit |
| JPS5385905A (en) * | 1977-01-10 | 1978-07-28 | Nobuhiko Kiyama | Base pile for increasing supporting force |
| JPS5449421A (en) * | 1977-09-27 | 1979-04-18 | Toyota Motor Corp | Controlling of run of internal combustion engine |
| JPS5491622A (en) * | 1977-12-28 | 1979-07-20 | Nissan Motor Co Ltd | Electronic control exhaust recirculation apparatus |
| JPS5498424A (en) * | 1978-01-19 | 1979-08-03 | Nippon Denso Co Ltd | Air supply controller for engine |
| JPS54137521A (en) * | 1978-04-18 | 1979-10-25 | Nissan Motor Co Ltd | Exhaust gas recycle controller |
| JPS54155317A (en) * | 1978-05-29 | 1979-12-07 | Nippon Denso Co Ltd | Revolution speed controller for engine |
| JPS6022190B2 (en) * | 1978-08-25 | 1985-05-31 | 日産自動車株式会社 | Exhaust recirculation control device |
| DE2948963C2 (en) * | 1978-12-06 | 1984-04-19 | Nissan Motor Co., Ltd., Yokohama, Kanagawa | Device for controlling the amount of recirculated exhaust gas and the idling speed in an internal combustion engine |
-
1979
- 1979-12-05 DE DE2948963A patent/DE2948963C2/en not_active Expired
- 1979-12-05 GB GB7941969A patent/GB2035453B/en not_active Expired
- 1979-12-05 US US06/100,636 patent/US4281631A/en not_active Expired - Lifetime
- 1979-12-06 FR FR7929974A patent/FR2443583A1/en active Granted
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4281631A (en) * | 1978-12-06 | 1981-08-04 | Nissan Motor Company, Limited | Exhaust gas recirculation and idle speed control device |
| US4300516A (en) * | 1979-05-15 | 1981-11-17 | Nissan Motor Company, Ltd. | System and method for controlling exhaust gas recirculation |
| US4289107A (en) * | 1979-12-28 | 1981-09-15 | Ford Motor Company | Engine carburetor throttle blade positioning control |
| FR2497283A1 (en) * | 1980-12-26 | 1982-07-02 | Fuji Heavy Ind Ltd | AIR / FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE WITH DOUBLE BODY CARBURETOR |
| EP0229315A2 (en) * | 1985-12-10 | 1987-07-22 | Hitachi, Ltd. | Automotive engine idle speed control device |
| EP0229315A3 (en) * | 1985-12-10 | 1988-10-05 | Hitachi, Ltd. | Automotive engine idle speed control device |
| US4823750A (en) * | 1985-12-10 | 1989-04-25 | Hitachi, Ltd. | Automotive engine idle speed control device |
Also Published As
| Publication number | Publication date |
|---|---|
| US4281631A (en) | 1981-08-04 |
| DE2948963C2 (en) | 1984-04-19 |
| FR2443583B1 (en) | 1985-03-15 |
| FR2443583A1 (en) | 1980-07-04 |
| GB2035453B (en) | 1983-03-23 |
| DE2948963A1 (en) | 1980-06-12 |
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| PCNP | Patent ceased through non-payment of renewal fee |